The American TV public, for the most part is about personalities. Nothing more, nothing less.
The next Food Network Star is about great ratings on Sunday Night, they aren't nearly as interested about what happens on the 9:30am (est) Sunday morning slot these shows fill. Aaron McGargill has some skills but other than Guy no one else has really made it. And I'm convinced Guy was a ringer from the beginning, they knew he was going to win.